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.TH FPUTWC 3C "March 25, 2020"
.SH NAME
fputwc, putwc, putwchar \- put wide-character code on a stream
.SH SYNOPSIS
.nf
#include <stdio.h>
#include <wchar.h>

\fBwint_t\fR \fBfputwc\fR(\fBwchar_t\fR \fIwc\fR, \fBFILE*\fR\fIstream\fR);
.fi

.LP
.nf
\fBwint_t\fR \fBputwc\fR(\fBwchar_t\fR \fIwc\fR, \fBFILE*\fR\fIstream\fR);
.fi

.LP
.nf
#include <wchar.h>

\fBwint_t\fR \fBputwchar\fR(\fBwchar_t\fR \fIwc\fR);
.fi

.SH DESCRIPTION
The \fBfputwc()\fR function writes the character corresponding to the
wide-character code \fIwc\fR to the output stream pointed to by \fIstream\fR,
at the position indicated by the associated file-position indicator for the
stream (if defined), and advances the indicator appropriately. If the file
cannot support positioning requests, or if the stream was opened with append
mode, the character is appended to the output stream.  If an error occurs while
writing the character, the shift state of the output file is left in an
undefined state.
.sp
.LP
The \fBst_ctime\fR and \fBst_mtime\fR fields of the file will be marked for
update between the successful execution of \fBfputwc()\fR and the next
successful completion of a call to \fBfflush\fR(3C) or \fBfclose\fR(3C) on the
same stream or a call to \fBexit\fR(2) or \fBabort\fR(3C).
.sp
.LP
The \fBputwc()\fR function is equivalent to \fBfputwc()\fR, except that it is
implemented as a macro.
.sp
.LP
The call \fBputwchar(\fR\fIwc\fR\fB)\fR is equivalent to
\fBputwc(\fR\fIwc,\fR\fB stdout)\fR\fI\&.\fR The \fBputwchar()\fR routine is
implemented as a macro.
.SH RETURN VALUES
Upon successful completion, \fBfputwc()\fR, \fBputwc()\fR, and \fBputwchar()\fR
return \fIwc\fR. Otherwise, they return \fBWEOF\fR, the error indicator for the
stream is set, and \fBerrno\fR is set to indicate the error.
.SH ERRORS
The \fBfputwc()\fR, \fBputwc()\fR, and \fBputwchar()\fR functions will fail if
either the stream is unbuffered or data in the \fIstream\fR's buffer needs to
be written, and:
.sp
.ne 2
.na
\fB\fBEAGAIN\fR\fR
.ad
.RS 10n
The \fBO_NONBLOCK\fR flag is set for the file descriptor underlying
\fIstream\fR and the process would be delayed in the write operation.
.RE

.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The file descriptor underlying \fIstream\fR is not a valid file descriptor open
for writing.
.RE

.sp
.ne 2
.na
\fB\fBEFBIG\fR\fR
.ad
.RS 10n
An attempt was made to write to a file that exceeds the maximum file size or
the process's file size limit; or the file is a regular file and an attempt was
made to write at or beyond the offset maximum associated with the corresponding
stream.
.RE

.sp
.ne 2
.na
\fB\fBEINTR\fR\fR
.ad
.RS 10n
The write operation was terminated due to the receipt of a signal, and no data
was transferred.
.RE

.sp
.ne 2
.na
\fB\fBEIO\fR\fR
.ad
.RS 10n
A physical I/O error has occurred, or the process is a member of a background
process group attempting to write to its controlling terminal, \fBTOSTOP\fR is
set, the process is neither ignoring nor blocking \fBSIGTTOU\fR, and the
process group of the process is orphaned. \fIstream\fR was created by
\fBopen_wmemstream\fR(3C) and a wide-character or byte sequence buffered is
invalid in the current locale.
.RE

.sp
.ne 2
.na
\fB\fBENOSPC\fR\fR
.ad
.RS 10n
There was no free space remaining on the device containing the file.
.RE

.sp
.ne 2
.na
\fB\fBEPIPE\fR\fR
.ad
.RS 10n
An attempt is made to write to a pipe or \fBFIFO\fR that is not open for
reading by any process. A \fBSIGPIPE\fR signal will also be sent to the calling
thread.
.RE

.sp
.LP
The \fBfputwc()\fR, \fBputwc()\fR, and \fBputwchar()\fR functions may fail if:
.sp
.ne 2
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 10n
Insufficient storage space is available.
.RE

.sp
.ne 2
.na
\fB\fBENXIO\fR\fR
.ad
.RS 10n
A request was made of a non-existent device, or the request was outside the
capabilities of the device.
.RE

.sp
.ne 2
.na
\fB\fBEILSEQ\fR\fR
.ad
.RS 10n
The wide-character code \fIwc\fR does not correspond to a valid character.
.RE

.SH USAGE
Functions exist for the \fBputwc()\fR and \fBputwchar()\fR macros. To get the
function form, the macro name must be undefined (for example, \fB#undef
putc\fR).
.sp
.LP
When the macro form is used, \fBputwc()\fR evaluates the \fIstream\fR argument
more than once. In particular, \fBputwc(\fR\fIwc\fR\fB, \fR\fI*f++\fR\fB)\fR
does not work sensibly.  The \fBfputwc()\fR function should be used instead
when evaluating the \fIstream\fR argument has side effects.
.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
l | l
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.BR exit (2),
.BR ulimit (2),
.BR abort (3C),
.BR fclose (3C),
.BR ferror (3C),
.BR fflush (3C),
.BR fopen (3C),
.BR setbuf (3C),
.BR attributes (7),
.BR standards (7)
